低渗透复杂介质中的渗流描述方法研究

Research on description method of percolation flow through complicated low permeability media.

杂乱的天然裂缝和因增产措施而诱发的人工压裂缝加剧了低渗透储层介质的复杂性。实验研究和现场实践表明 ,渗流的非线性和流态的多变性是低渗透复杂介质中的主要渗流特征 ,也是当今渗流力学界普遍关注的难题。本文根据实验并结合微分原理 ,提出了低渗透复杂介质系统内非线性渗流的微分线性描述方法 ,比较详细地介绍了该方法的原理、步骤和使用过程中应当注意的问题。该方法不但可以描述流体渗流的非线性 ,而且还能描述流体流态的多变性。

The disorderly natural fractures and manmade fractures created by well stimulations aggravate the complexity of the lowpermeability reservoirs. The experimental research and field practice demonstrate that the nonlinearity of percolation flow and variability of flow regime are the main flow features in the complicated lowpermeability media, and are also the difficult problems being concerned widely in the field of current percolation flow dynamics. According to the experiments and the differential theory, a differential and linear description method for the nonlinear flow in the complicated lowpermeability media is presented in this paper. The principle and operation steps of this method as well as the aspects that should be noticed during the application are all introduced at length. This method could not only represent the nonlinearity of percolation flow, but also characterize the variability of the flow regime of the fluid.